The GENUKI church database aims to include all parish churches that existed in 1837,
plus some others.
The most detailed entries include photographs and detailed descriptions,
as well as information about parish registers.

"The Geograph British Isles project aims to collect geographically representative
photographs and information for every square kilometre of Great Britain and Ireland."

MAGIC is a web-based interactive map service that brings together environmental information
from across government. It includes information on landscape, habitats, coastal and marine
resources, and nature reserves.

Get-a-map provides free access to modern Ordnance Survey mapping of your area,
and also lets you order paper copies.

Nearby.org provides links to other geo-referenced sites covering Great Britain.

"The GeoNames geographical database covers all countries and contains over
eight million placenames that are available for download free of charge."